docs: def write_fasttree_newick(self, tree, output_file_io):
          '''Write the given dendropy tree to the open output file I/O, ensuring that is
          acceptable for FastTree by e.g. removing quoted taxon names.
  
          Parameters
          ----------
          tree: dendropy.Tree
              tree to be written
          output_file_io: stream
              stream to write the newick formatted tree to
  
          '''
          newick = tree.as_string(schema='newick',
                                  suppress_internal_node_labels=True,
                                  suppress_internal_taxon_labels=True,
                                  preserve_spaces=False) # Labels must not be quoted.
          output_file_io.write(newick.replace("'",'').replace(' ','_'))